package com.weaver.qfengx.api.sf.shundiantong;

import com.google.common.collect.Lists;
import com.weaver.qfengx.CryptUtils;
import com.weaver.qfengx.DateUtils;

import java.io.UnsupportedEncodingException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;
import java.util.Arrays;
import java.util.Collections;
import java.util.List;

public class ShundiantongUtils {

    private static final char[] DIGITS = {'0', '1', '2', '3', '4', '5', '6', '7', '8', '9', 'a', 'b', 'c', 'd', 'e', 'f'};

    public static String encrypt32(String text) {
        MessageDigest msgDigest = null;
        try {
            msgDigest = MessageDigest.getInstance("MD5");
        } catch (NoSuchAlgorithmException e) {
            throw new IllegalStateException("System doesn't support MD5 algorithm.");
        }
        try {
            msgDigest.update(text.getBytes("UTF-8")); // 注意改接口是按照指定编码形式签名
        } catch (UnsupportedEncodingException e) {
            throw new IllegalStateException("System doesn't support your EncodingExcep tion.");
        }
        byte[] bytes = msgDigest.digest();
        String md5Str = new String(encodeHex(bytes));
        return md5Str.toString();
    }

    private static char[] encodeHex(byte[] data) {
        int l = data.length;
        char[] out = new char[l << 1];
        // two characters form the hex value.
        for (int i = 0, j = 0; i < l; i++) {
            out[j++] = DIGITS[(0xF0 & data[i]) >>> 4];
            out[j++] = DIGITS[0x0F & data[i]];
        }
        return out;
    }

    public static String sign(List<String> params) {
        Collections.sort(params);
        StringBuilder sb = new StringBuilder();
        for (String str : params) {
            sb.append(str);
        }
        try {
            return CryptUtils.md5(sb.toString());
        } catch (Exception e) {
            throw new RuntimeException("顺店通加签异常：" + Arrays.toString(params.toArray()));
        }
    }

    public static String sign2(List<String> params) {
        Collections.sort(params);
        StringBuilder sb = new StringBuilder();
        for (String str : params) {
            sb.append(str);
        }
        try {
            String sign = encrypt32(sb.toString());
            return sign;
        } catch (Exception e) {
            throw new RuntimeException("顺店通加签异常：" + Arrays.toString(params.toArray()));
        }
    }

    public static void main(String[] args) {
        List<String> params = Lists.newArrayList(
                "154258", "10101010", DateUtils.timestamp(), "82759c7d54b4d457"
        );

        System.out.println(sign(params));
        System.out.println(sign2(params));
    }
}
